Fillet of Beef with Stout and Oysters

The traditional beef-browned stew in Ireland is often cooked with stout instead of water and a beef, mushroom and oyster stew is a delight. (By the way, brown your meat and onions, add a little flour, tablespoon of tomato purée, some bay leaves and parsley, salt and pepper, a few mushrooms and simmer in stout until tender.) However, challenged by my great friend, the Irish chef Billy Mackesee to create an original Floyd Irish dish, I came up with this!